/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

package org.apache.jmeter.visualizers;

/**
 * The Interface to be implemented by any class that wants to be notified by
 * model which makes use of this callback-Interface.
 *
 */
public interface ModelListener {

    /**
     * Informs the Visualizer that the model has changed.
     */
    public void updateVisualizer();

    /**
     * Informs the Visualizer that a message should be displayed.
     */
    public void displayMessage(String messageString, boolean isError);
}
